Key to Ooctonus Haliday (Hymenoptera: Mymaridae) in China, with one new species and three new country records Author Aishan, Zhulidezi College of Life Science and Technology, Xinjiang University, Urumqi, Xinjiang, P. R. China. & Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, Urumqi, P. R. China Author Triapitsyn, Serguei V. 0000-0002-5086-7847 Entomology Research Museum, Department of Entomology, University of California, Riverside, California, 92521, USA. serguei. triapitsyn @ ucr. edu; https: // orcid. org / 0000 - 0002 - 5086 - 7847 serguei.triapitsyn@ucr.edu Author Zhu, Chao-Dong 0000-0002-9347-3178 Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, P. R. China. zhucd @ ioz. ac. cn; https: // orcid. org / 0000 - 0002 - 9347 - 3178 & State Key Laboratory of Integrated Pest Management, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, P. R. China zhucd@ioz.ac.cn Author Hu, Hong-Ying College of Life Science and Technology, Xinjiang University, Urumqi, Xinjiang, P. R. China. & Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, Urumqi, P. R. China text Zootaxa 2022 2022-06-23 5155 4 581 588 journal article 80410 10.11646/zootaxa.5155.4.7 1d896240-e838-4e07-92ed-15eb67f71f9f 1175-5326 6691760 8970F2CC-0411-4EA8-A5D6-5C7B62964F39 Ooctonus innermongolicus Aishan & Hu , sp. nov. ( Figs 1–4 ) Type material. Holotype ♀ (on slide) [ ICXU ], CHINA , INNER MONGOLIA , Arxan , 9.viii.2011 , F. Yuan ( Yuan Feng ), sweeping . Paratypes (on slides): same data as the holotype [ 2♀ ICXU , IZCAS ] ; TIBET , Gyirong , 21.vii– 2.viii.2021 , Q. Wu ( Wu Qingtao ), Malaise trap [ 5 ♀ , IZCAS ] . Description. Female ( holotype and paratypes ). Body length 1200–1300 µm. Head, mesosoma and gaster dark brown ( Fig. 4 ); antenna ( Fig. 1 ) with radicle, scape and F1 yellowish brown, F2–F8 and clava brown; petiole and legs yellow ( Fig. 4 ). Antenna ( Fig. 1 ) with radicle 0.35× total length of scape, rest of scape 4.2× as long as wide; pedicel 1.5× as long as wide, much longer than F1; F1 the shortest funicle segment, F2 and F3 subequal in length, F4 slightly shorter than F3, F5 the longest funicle segment, F6 slightly shorter than F7, F7 and F8 subequal in length; F1–F4 without mps, mps on F5 (2), F6 (1), F7 (2) and F8 (2); clava with 8 mps, 4.9× as long as wide, slightly longer than combined length of F6–F8. Mesosoma ( Fig. 2 ) with pronotum faintly sculptured; mesoscutum completely reticulate; scutellum with smaller-mesh sculpture than on mesoscutum and almost smooth anteriorly; frenum with inconspicuous reticulate sculpture except almost smooth medially; metascutellum smooth, posterior margin broadly rounded. Propodeum ( Fig. 2 ) with a small median areole, a long median carina not extending to anterior margin of propodeum, and nearly parallel but medially slightly convex lateral carinae extending to anterior margin of propodeum, but otherwise sculpture inconspicuous. Fore wing ( Fig. 3 ) 3.3× as long as wide, somewhat truncated apically; disc with a slight brownish tinge (not visible in image), densely setose except basal cell bare, the setae slightly sparser behind marginal and stigmal veins; longest marginal seta 0.23–0.24× greatest width of wing. Hind wing 16–20× (18× in holotype ) as long as wide; disc with a slight brownish tinge and sparsely setose behind and just beyond venation; longest marginal seta 1.8–2.0× greatest width of wing. Gaster shorter than mesosoma ( Fig. 4 ); petiole smooth, 5.0× as long as wide and 1.3× as long as metacoxa; ovipositor occupying about 0.4× length of gaster, exserted beyond apex of gaster by 0.09–0.1× (0.1× in holotype ) its own length, and 0.71–0.75× (0.75× in holotype ) as long as mesotibia. FIGURES 1–4. Ooctonus innermongolicus Aishan & Hu , ♀ holotype: 1, antenna; 2, mesosoma; 3, fore wing; 4, body. Measurements of the holotype (μm). Antenna: radicle: 65:22; rest of scape: 121:28; pedicel: 78:52; F1: 70; F2: 85; F3: 84; F4: 78; F5: 91; F6: 72; F7: 75; F8: 75; clava: 254. Mesosoma: 490. Fore wing: 1420:435; longest marginal seta: 104. Hind wing: 1060:59; longest marginal seta: 107. Petiole: 180; gaster: 450; ovipositor: 180. MALE. Unknown. Diagnosis. Females of this new species run to couplet 6 in the key to Palaearctic Ooctonus ( Triapitsyn 2018 ) together with O. locomotiv Triapitsyn and O. insignis Haliday. Females differ from the latter two species by the propodeum having a small median areole and a long median carina not extending to anterior margin of propodeum, but otherwise with inconspicuous sculpture, and ovipositor being short, occupying only about 0.4× the length of the gaster. Etymology. The species is named after the province in China where the holotype was captured. Hosts. Unknown.